Berate order for refund (6)
I believe the answer is:
rebate
'for refund' is the definition.
(rebate is a kind of refund)
'berate order' is the wordplay.
'order' indicates anagramming the letters.
'berate' is an anagram of 'REBATE'.
(Other definitions for rebate that I've seen before include "Sum paid back" , "Return of, eg, tax" , "Reduction in the cost" , "Discount - tax return?" , "price reduction" .)